Dichloroisocyanuric acid is harmful to human body. Dichloroisocyanuric acid is a broad-spectrum, highly efficient and new type of fungicide with strong bactericidal effect. However, if it is applied in excess or inhaled by mistake, it will have certain harm and damage to the human body. For example, if a large amount is inhaled into the trachea and esophagus through the nose and mouth, there will be spasm of the trachea and bronchial tubes, edema of the larynx, and there will be respiratory difficulties and suffocation. Sudden and large intake of very high concentrations can lead to acute pulmonary edema, or even pulmonary fibrosis leading to respiratory failure and death. In addition, if dichloroisocyanuric acid is accidentally taken, there will be digestive tract burns, burns, dichloroisocyanuric acid will release hypochlorous acid, and will cause people to appear photophobia, tears, runny nose and other symptoms.